The number, morphology, and distribution of retinal ganglion cells and optic axons in the Australian lungfish Neoceratodus forsteri (Krefft 1870)

Visual Neuroscience
Helena J BailesS P Collin

Abstract

Australian lungfish Neoceratodus forsteri may be the closest living relative to the first tetrapods and yet little is known about their retinal ganglion cells. This study reveals that lungfish possess a heterogeneous population of ganglion cells distributed in a horizontal streak across the retinal meridian, which is formed early in development and maintained through to adult stages. The number and complement of both ganglion cells and a population of putative amacrine cells within the ganglion cell layer are examined using retrograde labelling from the optic nerve and transmission electron-microscopic analysis of axons within the optic nerve. At least four types of retinal ganglion cells are present and lie predominantly within a thin ganglion cell layer, although two subpopulations are identified, one within the inner plexiform and the other within the inner nuclear layer. A subpopulation of retinal ganglion cells comprising up to 7% of the total population are significantly larger (>400 microm2) and are characterized as giant or alpha-like cells. Up to 44% of cells within the retinal ganglion cell layer represent a population of presumed amacrine cells. The optic nerve is heavily fasciculated and the proportion of myelinated...Continue Reading

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Citations

Jul 19, 2012·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Thomas J LisneyDouglas R Wylie
Oct 27, 2007·BMC Evolutionary Biology·Helena J BailesShaun P Collin
Dec 19, 2008·BMC Ecology·Nathan S HartShaun P Collin
Nov 10, 2009·Experimental Eye Research·Elena CidAlmudena Velasco
Nov 20, 2013·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Thomas J LisneyAndrew N Iwaniuk
Jul 2, 2008·Vision Research·James K Bowmaker
Jun 23, 2012·Brain, Behavior and Evolution·Thomas J LisneyDouglas R Wylie
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Nov 30, 2019·The Journal of Experimental Biology·Valerio TettamantiFabio Cortesi
Mar 11, 2020·The Journal of Comparative Neurology·Thomas J LisneyShaun P Collin

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